Tilting furnace



Oct. 4, 1932. v c. c. BURT ET AL 1,830,763

TILT-ING FURNACE Filed July 17, 1930 4 Sheets-Sheet 1 ATTORNEYAI,

Oct. 4, 1932. c. c.- BURT ET AL 1,880,763

TILTING FURNACE Filed July 17, 1930- 4 Sheets-Sheet 2 ATTORNEY/i/ Oct. 4, 1932. "1,880,768

(1 C. BURT ET AL TILT ING FURNACE Filed July 17, 1950 4 Sheets-Sheet 3 unw - I HIIHII Oct. 4, 1932. c. c. BURT ET AL I 1,880,768

TIL-TING FURNACE I Filed July 1'7. .1930 4 Sheets-Sheet 4 ATTORNEY/L Patented Oct. 4, 1932 UNITED srrss PANT CARL C. BURT AND IVAN L. ANDERSON, 0F SALT LAKE CITY, UTAH, ASSIGNOR-S TO AMERICAN SMELTING & REFINING COMPANY, OF NEW YORK, N. Y., A CORPORA- TION OF NEW JERSEY TILTING FURNACE Application filed July 17, 1930. Serial No. 468,517.

The invention relates to metallurgy, and more particularly to tilting furnaces such as are used in the refining of copper.

In the operation of a tilting furnace hot matte or copper is charged into them, and then heated or otherwise treated in various ways resulting in wearing, burning or washing away of parts of the brick lining. Whenever any portion of the brick lining becomes thin enough there is the attendant danger of burning the steel shell, and therefore, it is customary to shut down the furnace and repair the lining.

According to a preferred form of the invention, the tilting furnace is made in the form of a horizontal cylinder, which is'discontinued or open at the top. Suitable reenforcing rings surround the cylindrical shell to strengthen the furnace. Closing the open top of the cylinder a roof is provided which may be independently supported by the frame work of the furnace. If desired, the roof may be supported by the reenforcing rings and the roof support on one side may be adjustable to take care of expansion of the roof. If desired. a second roof may be inde pendently supported next to and above the first in a manner similar to the first. The second roof, therefore, may become in effect a spare roof and comes into use when the first roof burns through. If desired, the second roof may be installed only when the first roof shows signs of collapsing.

The invention also consists in certain new and original features of construction and combinations of parts hereinafter set forth and claimed.

Although the novel features which are believed to be characteristic of this invention will be pointedout with particularity in the claims appended hereto,.tl1e invention itself, as to its objects and advantages, the mode of its operation and the manner of its organization may be better understood by referring to the following'description taken in connection with the accompanying drawings forming a part thereof, in which Figure'l is a section on the line l1 of Figure 2;

Figure 2is a side elevation with parts broken away;

Figure 3 is an enlarged fragmentary View taken on the line 3-3 of Figure 2;

Figure 4; is an end View of the furnace;

Figures 5 and 6 are sections taken on the lines 5 5 and 6-6 respectively of Figure. 3; and

Figure 7 is a detailed section taken on the line 77 of Figure 2.

In the following description and in the claims parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar parts as the art will permit.

Like reference characters denote like parts in the several'figures of the drawings.

In the drawings accompanying and forming part of this specification, a practical commercial embodiment of the invention is disclosed, butas such illustration is primarily for purposes of disclosure, it will be understood that the structure may be modified in various respects without departure from the broad spirit and scope of the invention as hereinafter defined and claimed.

Referring now to the drawings, the furnace cylinder is made up of a metal skin 10 lined with a suitable brick lining 11, the cylinder being open or discontinued at the top as indicated in Figure 1, the open top being closed by the roofs and 55.

Surrounding the cylindrical shell are a plurality of reenforcing rings, which comprise a pair of riding rings 12 and 13, intermediate rings 14, and .end rings 15.

Each of the riding rings comprises an upper half section 16 and a lower half section 17 connected preferably by shrink links 18, keys 19, and bolts 20. The upper half of the riding'ring has its interior radius increased at 21, as shown in F igure 1, forming a pair of shoulders 22 and 23 for supporting the inner roof a5. Suitable webs or flanges 24 and 25 are provided on the roof 55.

upper section 16 for supporting the outer The intermediate rings 14 and the end member 49 and the flange of the H-beam ad.-v

gether in the same manner as the riding rings 12 and 13. The upper half sections are substantially the same as the upper half sections of the riding rings. The outer radius of the lower half sections are reduced, as at in Figure 4.

For rotatably mounting the cylindrical furnace shell a support 26 is provided to which is pivoted a pair of holders 27 and 28 each of which journals a pair of rollers 29, which engage the riding rings 12 and 13. In addition, the riding ring 12 has a gear segment 31 bolted thereto which is engaged by a pinion gear 32 driven by a suitable source to tilt the furnace.

The cylindrical shell furthermore com prises metal end walls 33 having linings 34. One of the end walls is provided with an opening through which a pipe 35 may be introduced for the feeding of coal or any other desired material. For strengthening the end walls a plurality of stays 36 of variable length are secured to the end rings 15 by a plurality of spring connections. Each spring connection comprises a bolt 37 pass ing through the end of the stay 36 and the end ring 15 and a spring 39 positioned between the end ring 15 and an abutment 38 on the bolt 37. g

For connecting the strengthening rigs at the top of the cylindrical shell where the cylindrical wall is discontinued, a plurality of tie rods 40 and 41 may be provided, each tie rod connecting adjoining rings only. For instance, the tie rods 40 connect one intermediate ring 14 and riding ring 13, while the tie rods 41, which are offset from the tie rods 40, connect the riding ring 13 to the end ring 15.

For supporting the inner roof a stationary skewback in the form of a channel iron 42 rests against the shoulders 22, and extends the entire length of the cylindrical shell. A plurality of reenforcing I-bea-ms 43 are secured to the channel 42 between rlngs.

A movable skewback in the form of a channel 44 is provided, the roof proper fit ting between the channels 42 and 44. V

For supporting movable skewback 44 an H-beam 46 rests on the shoulders 23 and extends the length of the furnace. A plural ity of angle irons 47 are secured to the channel 44 and rest upon the H-beam 46. A plurality of spring devices are placed between the H-beam 46 and the skewback 44, these being distributed along the length of the furnace. Each spring device comprises a bolt 48 passing through openings in the flanges of the H-beam, a nut member 49 threaded upon the bolt 48 and so arranged as not to turn when the bolt 48 is turned, and a coilspring 50 between a flange on the nut joining the shoulder 23.

The outer roof is supported independently of the-inner roof 45, and in a manner similar thereto. The webs 24 support a stationary skewback 52, which extends the entire length of the furnace. The skewback 52 is in the form of a continuous channel iron with its bottom half extending the length of the furnace, but being provided with slots in its upper half 71 to receive the several reenforc'ing rings. forcing the skewback a plurality of I-beams 53 are provided between rings.

For supporting the movable skewback 54 a plurality of H-beams 56 are provided su1tably connected to webs between the several rings. The skewback54 is in the form of a continuous channel iron extending the length of the furnace, but being provided with slots to receive theseveral reenforcing rings. A plurality of angle irons 57 are socured to the skewback 54 and rests upon the several H-beams 56.

A plurality of spring devices are provided between the movable skewback 54 and the H beams 56, being distributed along the length of the furnace. The parts of these spring devices are identified by 58, 59 and 60, and are similar in construction and in operation to the spring devices identified by 48,49 and 50 above described.

On the sides of-the furnace are two spouts, 61 on one side and 62 on the other, these spouts having openings below the roof of the furnace. These spouts are formed by extending outwardly the skin of the cylindrical furnace, and are suitably lined and reenforced as 'shown. If desired, coverings 63 may be placed over the adjoining parts of the roof supporting members for protecting them from the materials passing through the spouts 61 and 62.

It will be understood that the lining material for the cylindrical shell and vthe end walls may be of any desired'construction, and in some cases it may be magnesite. The roof walls 45 and 55 between skewbacks may be of any desired material and construction.

From theabove it will be seen that the skewbacks are so arranged as to carry the entire weight of both the original and secondary arches, and therefore, repairs can be made to the other parts of the linings with out disturbing the arches. Furthermore, the arched roofs are supported independently of each other and of the lining, and consequently the failure of the original or lower arch will not affect" the secondary or upper arch. By supporting the skewbacks on a combination of springs and bolts as shown, any expansion of the arches due to heat will immediately start compressing the springs the span between skewbacks, and thus prevent undue strain upon the arches.

For reen- Under certain conditions the springs may be omitted if the screws are adjusted to increase the span between skewbacks as the arches expand. When springs are. provided they absorb small movements of the arch without the necessity of adjusting the screws, relieve the strain from skewback supports and arch and also give a visual indication of the amount of expansion or contraction taking place.

It will be understood that the cylindrical skin 10 is riveted to the several reenforcing rings, and that the other parts of the furnace are arranged to take care of expansion and contraction in accordance with well-known engineering practices.

While certain novel features of the invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the forms and de tails of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention.

hat is claimed is:

1. A tilting furnace comprising a curved shell having an open top, strengthening rings surrounding said shell and passing over said open top, upper and lower roofs over said open top but within said rings, and means for supporting said roofs from said rings independent of each other and of said shell.

2. In a metallurgical furnace, side Walls and independent inner and outer roofs between said side walls, said outer roof being effective when said inner roof fails, and means for separately supporting said roofs.

3. In a tilting furnace, a substantially horizontal cylindrical shell having an open top, strengthening rings surrounding said shell, upper and lower pairs of abutments on said rings, one abutment of each pair being disposed at each side of said open top, upper and lower pairs of'skewbacks, upper and lower roof arches, one between each pair of skewbacks, and means supporting said pairs of skewbacks by said abutments respectively.

I. In a tilting furnace, a horizontal cylindrical shell having an open top, strengthening rings'surrounding said shell, upper and lower pairs of abutments on said rings, one abutment of each pair being disposed at each side of said open top, upper and lower pairs of skewbacks, upper and lower roof arches, one between each pair of skewbacks, one of each pair of skewbacks resting on one of said abutments on one side, upper and lower longitudinal members resting on said abutments on the other side, and upper and lower sets of devices to take care of expansion of said arches between said longitudinal members and said other skewbacks.

5. In a tilting furnace, a horizontal cylindrical shell having an open top, strengthening rings surrounding said shelhupper and lower pairs of abutments on said rings, one abutment of each pair being disposed at each side of saidopen top, upperand lower pairs of skewbacks, upper and lower roof arches, one between each pair of skewbacks, one of each pair of skewbacks resting on one of said abutments on one side, upper and lower longitudinal members resting on said abutments on the other side, upper and lower sets of spring devices between-said longitudinal members and said other skewbacks, said shell being connected to said rings, separate tie rods between said rings each connecting two adjoining rings only and at the upper parts thereof, lining for said cylindrical shell independent of said roof arches, certain of said rings being riding rings, and rollers under said riding rings supporting said shell.

6. In a tilting furnace, a horizontal cylindrical shell having an open top, strengthening rings surrounding said shell, upper and lower pairs of abutments on said rings, one abutment of each pair being disposed at each side of said open top, upper and lower pairs of skewbacks, upper and lower roof arches, one between each pair of skewbacks, one of each pair of skewbacks resting on one of said abutments on one side, upper and lower longitudinal members resting on said abutments on the other side, upper and lower sets of spring devices between said longitudinal members and said other skewbacks, said shell being connected to said rings, separate tie rods each connecting two adjoining rings only and at the upper parts thereof for said cylindrical shell independent of said roof arches, certain of said rings being riding rings, end walls for said shell, parallel stays across said end walls secured to the end rings, and rollers under said riding rings supporting said shell.

7 In a tilting furnace, a framework,

curved side walls, a. primary roof, a secondary roof above said primary roof, and means for supporting said roofs by said framework independently of each other and of said side walls.

8. In a tilting furnace, a framework, curved side walls, a primary roof, a second ary roof next above said primary roof, means for supportingsaid roofs by said framework independently of each other and of said side walls, and means for separately permitting expansion of said roofs.

9. In a tilting furnace, a framework, side walls, a roof and means for supporting said roof from said framework independently of said side walls.

10. In a tilting furnace, side walls, a roof, a framework, and means for supporting said roof by said framework to permit expansion of slilld roof without distorting said framewor 11; In a tilting furnace, a shell havingan open top, strengthening members surround ing said shell, abutments on said strengthening members, a roof over said top and receiving support from said abutments, and yieldable means between certain of said abutments and said roof to allow expansion thereof Without distorting said strengthening members. 8

In testimony whereof We have hereunto set our hands.

CARL G. BURT.

IVAN L. ANDERSON. 

